This is a Q1 mod, so if sidequest supports modding games and Q1 on there is a source port, then yes this should work
"Quake Brutalist Jam III was created for explicit use with the Ironwail source port, version 0.8.1 and above. If using other engines, especially the Quake Remaster, expect issues."
alt Hacker News
"Quake Brutalist Jam III was created for explicit use with the Ironwail source port, version 0.8.1 and above. If using other engines, especially the Quake Remaster, expect issues."